latshaw



2 Sheets-Sheet 1.

(No Model.)

J. 8u J. H. LATSHAW.

SAND MOLDING MACHINE.

PaentedV June 7, 18871.

n. Q.. w., .F

l l\\\\ \\\\\\l (No Moda.) 2 sheets-sheet z.'

J. 8v J. H. LATSHAW.

SAND MOLDING MACHINE.

10.364,355. PatentedJune 7, 1887.

. mzwssg, (rn/Zwan.

cyaan@ N4 PETERS, Phulu-Likhogrlpher. Wuhinginn, D` C.

UNITED lSTATES PATENT Ormea.,

JOHN LATSHAT AND JOHN H. LATSHAW, OF INDIANAPOLIS, INDIANA; SAID JOHN LATSHAV ASSIGNOR TO XVILLIAM O. VHITEHEAD, OF

SAME PLAGE.

sAND-MoLDINe MACHINE.

SPECIFICATION forming part of Letters Patent No. 364,355, dated June 7, 1887.

Application filed January 10, .1887. Serial No. 223,848. (No model.)

To @ZZ whom it may concern:

Beit known that we, JOHN LATSHAW and Jol-IN H. LATsHAw, of Indianapolis, county of Marion, State of Indiana, have inventedcertain new and useful Improvements in Sand- Molding Machines; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which like letters refer to like parts.

Our invention relates to the construction of sand-molding machines, and is an improvement upon the device for which Letters Pat ent No. 283,905 were issued to John Latshaw, of Indianapolis, Indiana, on the 28th. of August, 1883, and will be understood from the following description.

In the drawings, Figure l is a side elevation, partly in section, of our device with the patterns thrown up above the level of the parting-plate. Fig. 2 is a sectional side elevation of the device, with a portion ofthe frame-work and the lever removed, so as to show the interior arrangement, the patterns being below the parting-plate. Fig. 3 is a detail bottom view of a portion of the pattern-plate, showing the openings to allow the sand to escape through. Fig. 4 is a section of the shaft and its arms, showing the adjustable boxing which connects the adjustable link to one of the arms and the manner in which the other link is secured to the opposite arm. Fig. 5 is a detail rear view of the jointed levers, showing their connection to the pattern-plate and the crossbars in the central lower portion of the framework. Fi g. 6 is a detail side view of the hangers at either end of the machine, in which the slides connected with the patternplate move, the dotted lines indicating the position of the parts when the pattern-plate is lowered.

In detail, fis a frame-work, which for convenience is mounted upon rollers, the base preferably made some'n hat wider between the legs than at the top of the machine, and con-- necting the cross-pieces at the ends are a pair of parallel bars which provide bearings between them for the lower halves of the jointed levers j and j', these bars being cut out in the center to prevent any contact between them and the screw Sc in the end of lower arm, a', connected to the rock-shaft s. This shafts has bearings in brackets b, one of which is fastened on each side of the frame and central thereon, and to the outer end of this rock-shaft is attached a lever, Z, which moves along the face of the quadrantbar q, having holes for the insertion of pins, which serve as stops to limit the movement of this lever, and thus regulate the distance to which the pattern will be allowed to rise above the level of the parting-plate.

The rock-shaft has opposite arms, a and a', integrally connected therewith, and to the upper end of the arm a is pivoted one end of the solid link Z', its opposite end being pivoted at h2 to the jointed levers j', the lower one of which is pivoted between the central crossbars of the frame-work at 2, while the upper one is pivoted in a slight projection from the under side of the pattern-plate t. This pivotal point is also marked 2, and it isl essential in the construction of the machine that these pivotal points 2 2should be in the same vertical plane with each other, and in a plane parallel with the pivotal points 1 l of the jointed levers j at the opposite ends of the inachine. The lower end of the arm ci is recessed to form a boxing, 11x, in which moves a block or cross-head, bl, as shown in Fig. 4. This block is provided with short stub-bolts, which pass through slots in the sides of the boxing and are threaded on the ends to receive nuts n2 and a, and just back of the nut yn'and upon that portion of the stub-bolt which is not threaded, the adjustable lilik Z2 has a bearingconnection.

The block bZ has a central threaded bore to receive the screw so, which secures the block at any desired point within the length ot' the boxing whenever it is necessary to adjust the working length of the arm a' at that point( The link Z" is made in two parts connected by a screw-swivel, sw, as shown in Fig. 2, and l justment as tolength of this link may be made and secured. The outer end of this link is hinged at h to the jointed levers j, the upper one of which is pivoted at l on the under side of the pattern-plate, while the lower one is pivoted at 1 between the parallel bars before mentioned.

The upper table, t, which serves as a parting-plate, has openings to admit patterns p, which rest upon the pattern-plate t', to which the jointed levers are connected., as hereinbefore described. This pattern-plate may be made solid, but is preferably constructed with flaring openings, as shown in Fig. 3, so that any sand collecting thereon, and which upon a solid plate would be likely to remain and hinder the even bearing of the top of the pattern-plate against the under side of the parting-plate, would fall through these openings and out of the way.

h and h3 are hangers bolted to the opposite sides of the frame, and are in line with and parallel with each other, their inner projecting portions being grooved to admit slides s, which are connected to the under side of the pattern-plate, so that the movement ofthe latter will be regular and uniform. The pattern- ,plate, therefore, by its connection to the jointed levers and by means of the slides moving in the grooves of the hangers, is prevented from getting out of line, thus insuring a true movement when the machine is in operation. Sometimes in setting up the machine the parts may be connected in such manner that the pattern-plate will not be level, and so l provide bymeans ofset-screws ss ss for the leveling up of the pattern-plate through its connection with the levers, as shown in Fig. 5. It will be seen, therefore, that the patternplate itself is capable of adjustment after the machine is set up, and that the movement of the levers is also capable of adjustment, so that in lifting the pattern-plate it will be at all pointsparallel with the parting-plate, insuring a perpendicular movement of the patterns. This adjustment is accomplished by means of the boxing in the end of the arm a and the swivel mechanism in link Z2. We have found, after careful experiment, that when the links Z and Z2 are of equal length the machine will not work so well, as the ends of the patternplate are not thereby raised simultaneously to the same level, and the result is all parts of the mold are not of the same thickness, and we have therefore provided that the link Z2 is made shorter than link Z', for the reason that when the levers j and j approach a vertical position in lifting the pattern-plate the movement is not quite the same at the opposite ends of the patern-plate, and where the links Z and Z2 are of equal length the unequal lifting of the ends of the pattern-plate causes the slides at one end to cramp in the guides, further retarding its movement and straining the guides themselves. What the exact difference between the length of these links ought to be is not easy to forecast with certainty, in-

asmuch as it depends, among other things, upon how exact the patterns are made and how carefully the machine is set up. "We therefore provide means for adjustment of the length of one of the link s within a range to include all probable variations.

The center of the shaft s is equidistant diagonally from the upper-and lowerpivotal points, 1 1 and 2 2, of the jointed levers, and is also in the center of a line drawn from 7L to h'I when the pattern is raised and the parts are in the position shown in Fig. 1.

inasmuch as it is always necessary that the distance from the center of the shaft s to the pivotal connection of the link Z2 with the lower arm, a, should be less than the corresponding distance on the opposite arm, the arm a should be made shorter than the upper arm, a, if the adjusting boxing mechanism bm be not employed, but as the difference in length is a matter of nice calculation the adjusting mechanism herein shown is much to be preferred over any form of solid construction.

The machine operates as follows: The pattern p is iirmlysecured in place upon the pattern-plate and raised by means of the handn lever Z above the parting-plate, as shown in Fig. l. The flask ji is then placed over it, filled with sand, and rammed in the usual way. The rest of the operation is performed in a similar manner, and the pattern is then withdrawn by a careful reverse movement of the handlever,and the mold finished and removed.

It will be seen, upon careful consideration,

that in reversing the movement of the handlever to withdraw the pattern the downward movement of the pattern-plate is slow at first, and increases as the pivotal centers 7L and h of the toggle-levers reeedelfrom the center of /the shaft s and approach the position shown in Fig. 2, and this movement is equalized at both ends of the pattern-plate by means of the unequal length of the links Z and Z2 and arms a and a'. This peculiar movement of the pattern-plate is precisely what is required, so that the pattern shall be slowly and evenly dislodged from its close contact with the sand, so as not to pull away any part of it or break the edges; but afterthe pattern has once been fairly freed from such contact its withdrawal may be more rapidly accomplished.

What we claim, and desire to secure by LetA ters Patent, is the following:

1. In a sand-molding machine, a patternplate connected below to a pair of toggle-le- IOO IIO

vers at each end, and links of unequal length connecting such levers to the opposite arms of a shaft supported in bearings in the frame, whose partial revolution lifts the pattern through openings in a parting-plate, also supported in the frame, all combi ned substantially as described.

2. In a sand-molding machine, a pattern-plate connected beneath and at each end to a pair of toggle-levers, and links of unequal length conneeting such levers tothe opposite arms (which are also of unequal length) of a shaft supported in bearings in a frame-work, whose revolution in one direction lifts and in the other lowers the pattern through openings in a parting# plate supported on top of such frame, all conibined substantially as described.

3. In asandmolding machine,apatternplate connected beneath and at each end to a pair of toggle-levers, and links of unequal length, one of which is adjustable lengthwise, connecting such levers to opposite arms of a shaft supported in bearings connected with the frame, Whose partial revolution in one direction lifts and in the other lowers the pattern through openings in a parting-plate, also connected with the frame-work, all combined substantially as described.

4. In asand-moldingmacl1ine,apattern-plate connected beneath and at each end to a pair of JOHN LATSHAW. n JOHN H. LATSHAW. Vitnesses:

t C. P. JiiooBs,

W. C. WHITEHEAD. 

